When the march of thought towards unity has reached its limit in pure monotheism, the work of theologians and especially of metaphysicians tends to refine the conception of divinity, assumed as First Cause, or moral ideal, or both at once, but always as an inaccessible ideal, visible only in occasional glimpses. The logical, necessary, inevitable consequence is the weakening of the emotional state. In fact, we may lay down the following principle:— From the perception to the image, and from the image to the concept, the concomitant emotional element keeps on diminishing, other things being equal; for we must take into account differences of temperament and individual variations. This is only a summary way of stating what I have so often said in Part I.: emotional states, beyond all others, depend on physiological (visceral, motor, and vaso-motor) conditions. Now it is clear that perception is the operation which most rigorously demands complex organic conditions. Among images or representations there are two categories: the vivid and intense imagination approximates, by its hallucinatory tendency, to the percept; while the cold and dull imagination, which is a bare outline of things, approaches the nature of a concept. Finally, the pure concept, reduced almost entirely to a sign, a substitute for reality, is as much detached from organic conditions as it is possible for a psychic state to be; it requires a _minimum_ of physiology. In consequence, emotion, attacked at its source, flows very scantily; and of the religious feeling properly so called there remains only a vague respect for the unknowable—for the x—the last survival of fear and a certain attraction towards the ideal which is the last remnant of the love dominant during the second period. We might say in clearer and simpler terms that religion tends to become a _religious philosophy_, which is an entirely different thing, for each corresponds to a distinct psychological condition, one being a theoretic construction of argumentative reason, the other the living work of a group of persons or an inspired great man, involving the whole man, his thoughts and feelings. This distinction is extremely important and throws light on our subject.